/**
 * API Client Wrapper
 * Centralized API communication with auth handling
 */

const api = {
    /**
     * Get the auth token from localStorage
     */
    getToken() {
        return localStorage.getItem('access_token');
    },

    /**
     * Set the auth token
     */
    setToken(token) {
        localStorage.setItem('access_token', token);
    },

    /**
     * Clear the auth token
     */
    clearToken() {
        localStorage.removeItem('access_token');
    },

    /**
     * Check if user is authenticated
     */
    isAuthenticated() {
        return !!this.getToken();
    },

    /**
     * Redirect to login if not authenticated
     */
    requireAuth() {
        if (!this.isAuthenticated()) {
            window.location.href = '/login';
            return false;
        }
        return true;
    },

    /**
     * Make an API request
     */
    async request(method, url, data = null) {
        const options = {
            method,
            headers: {}
        };

        const token = this.getToken();
        if (token) {
            options.headers['Authorization'] = `Bearer ${token}`;
        }

        if (data) {
            options.headers['Content-Type'] = 'application/json';
            options.body = JSON.stringify(data);
        }

        const response = await fetch(url, options);

        // Handle 401 - redirect to login
        if (response.status === 401) {
            this.clearToken();
            window.location.href = '/login';
            return null;
        }

        return response;
    },

    /**
     * GET request
     */
    async get(url) {
        return this.request('GET', url);
    },

    /**
     * POST request
     */
    async post(url, data) {
        return this.request('POST', url, data);
    },

    /**
     * PUT request
     */
    async put(url, data) {
        return this.request('PUT', url, data);
    },

    /**
     * PATCH request
     */
    async patch(url, data) {
        return this.request('PATCH', url, data);
    },

    /**
     * DELETE request
     */
    async delete(url) {
        return this.request('DELETE', url);
    },

    /**
     * Get current user info
     */
    async getCurrentUser() {
        const response = await this.get('/api/auth/me');
        if (response && response.ok) {
            return await response.json();
        }
        return null;
    },

    /**
     * Login
     */
    async login(email, password) {
        const response = await fetch('/api/auth/login', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ email, password })
        });

        if (response.ok) {
            const data = await response.json();
            this.setToken(data.access_token);
            return { success: true };
        }

        const error = await response.json();
        return { success: false, error: error.detail || 'Login failed' };
    },

    /**
     * Register
     */
    async register(email, password, name, officeId = null) {
        const response = await fetch('/api/auth/register', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ email, password, name, office_id: officeId })
        });

        if (response.ok) {
            const data = await response.json();
            this.setToken(data.access_token);
            return { success: true };
        }

        const error = await response.json();
        return { success: false, error: error.detail || 'Registration failed' };
    },

    /**
     * Logout
     */
    async logout() {
        await this.post('/api/auth/logout', {});
        this.clearToken();
        window.location.href = '/login';
    }
};

// Make globally available
window.api = api;